Edge-based adaptive machine learning for object recognition

ABSTRACT

Examples of techniques for adaptive object recognition for a target visual domain given a generic machine learning model are provided. According to one or more embodiments of the present invention, a computer-implemented method for adaptive object recognition for a target visual domain given a generic machine learning model includes creating, by a processing device, an adapted model and identifying classes of the target visual domain using the generic machine learning model. The method further includes creating, by the processing device, a domain-constrained machine learning model based at least in part on the generic machine learning model such that the domain-constrained machine learning model is restricted to recognize only the identified classes of the target visual domain. The method further includes computing, by the processing device, a recognition result based at least in part on combining predictions of the domain-constrained machine learning model and the adapted model.

DOMESTIC PRIORITY

This application claims the benefit of U.S. Provisional PatentApplication No. 62/411,900, entitled “ADAPTIVE MACHINE LEARNING FOROBJECT RECOGNITION,” filed Oct. 24, 2016, and U.S. Provisional PatentApplication No. 62/413,008, entitled “ADAPTIVE MACHINE LEARNING FOROBJECT RECOGNITION,” filed Oct. 26, 2016, the disclosures of which areincorporated by reference herein in their entirety.

BACKGROUND

The present invention generally relates to object recognition and, moreparticularly, relates to edge-based adaptive machine learning for objectrecognition.

Contemporary mobile devices, such as smartphones, tablets, mobilerobots, etc., can be equipped with capable cameras and powerfulprocessors that enable mobile computer vision applications such asaugmented reality, self-driving cars, robotic pets, and the like. Thecore functionality underlying many of these applications is objectrecognition (i.e., running computer programs to identify objects in animage or video sequence).

Some existing object recognition systems use techniques that operaterobustly for specialized tasks (e.g., wine label reading, product labelreading, OCR-based language translation, etc.). Existing augmentedreality (AR) systems use sensor techniques for context inferencecombined with computer vision algorithms for recognition of imageobjects taken by devices. These systems can operate robustly under theassumption of specialized tasks or controlled environments (e.g.,matching test images to a set of training images that were taken undersimilar conditions in the same location and exist in an image database.

SUMMARY

One or more embodiments of the present invention provide methods,systems, and/or computer program products for adaptive objectrecognition for a target visual domain given a generic machine learningmodel.

According to one or more embodiments of the present invention, acomputer-implemented method for adaptive object recognition for a targetvisual domain given a generic machine learning model includes creating,by a processing device, an adapted model and identifying classes of thetarget visual domain using the generic machine learning model. Themethod further includes creating, by the processing device, adomain-constrained machine learning model based at least in part on thegeneric machine learning model such that the domain-constrained machinelearning model is restricted to recognize only the identified classes ofthe target visual domain. The method further includes computing, by theprocessing device, a recognition result based at least in part oncombining predictions of the domain-constrained machine learning modeland the adapted model.

Additional features and advantages are realized through one or moreembodiments of the present invention. Other aspects are described indetail herein and are considered a part of the disclosure. For a betterunderstanding of the embodiments of the present invention with theadvantages and the features, refer to the following description and tothe drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The subject matter that is regarded as the invention is particularlypointed out and distinctly claimed in the claims at the conclusion ofthe specification. The foregoing and other features, and advantagesthereof, are apparent from the following detailed description taken inconjunction with the accompanying drawings in which:

FIG. 1 depicts a block diagram of a system for adaptation trainingaccording to one or more embodiments of the present invention;

FIG. 2 depicts a screenshot of a local adaptation task specificationaccording to one or more embodiments of the present invention;

FIG. 3 depicts a flow diagram of a method for object recognition usinglate fusion according to one or more embodiments of the presentinvention;

FIG. 4 depicts a flow diagram of a method for combined adaptationtraining and recognition according to one or more embodiments of thepresent invention;

FIG. 5 depicts an example of pseudo code for an enhanced bounding boxesstrategy for object recognition according to one or more embodiments ofthe present invention;

FIG. 6 depicts an example of pseudo code for distributed image pruningfor distributed data clustering according to one or more embodiments ofthe present invention.

FIG. 7 depicts a flow diagram of a method for interactive generation oflabeled data and training instances according to one or more embodimentsof the present invention;

FIG. 8 depicts a flow diagram of a method for identifying representativesamples from datasets across multiple devices according to one or moreembodiments of the present invention;

FIG. 9 depicts a block diagram of a processing system for implementingembodiments of the present invention described herein;

FIG. 10 depicts a cloud computing environment according to one or moreembodiments of the present invention; and

FIG. 11 depicts abstraction model layers according to one or moreembodiments of the present invention.

DETAILED DESCRIPTION

Various embodiments of the invention are described herein with referenceto the related drawings. Alternative embodiments of the invention can bedevised without departing from the scope of this invention. Variousconnections and positional relationships (e.g., over, below, adjacent,etc.) are set forth between elements in the following description and inthe drawings. These connections and/or positional relationships, unlessspecified otherwise, can be direct or indirect, and the presentinvention is not intended to be limiting in this respect. Accordingly, acoupling of entities can refer to either a direct or an indirectcoupling, and a positional relationship between entities can be a director indirect positional relationship. Moreover, the various tasks andprocess steps described herein can be incorporated into a morecomprehensive procedure or process having additional steps orfunctionality not described in detail herein.

The following definitions and abbreviations are to be used for theinterpretation of the claims and the specification. As used herein, theterms “comprises,” “comprising,” “includes,” “including,” “has,”“having,” “contains” or “containing,” or any other variation thereof,are intended to cover a non-exclusive inclusion. For example, acomposition, a mixture, process, method, article, or apparatus thatcomprises a list of elements is not necessarily limited to only thoseelements but can include other elements not expressly listed or inherentto such composition, mixture, process, method, article, or apparatus.

Additionally, the term “exemplary” is used herein to mean “serving as anexample, instance or illustration.” Any embodiment or design describedherein as “exemplary” is not necessarily to be construed as preferred oradvantageous over other embodiments or designs. The terms “at least one”and “one or more” may be understood to include any integer numbergreater than or equal to one, i.e. one, two, three, four, etc. The terms“a plurality” may be understood to include any integer number greaterthan or equal to two, i.e. two, three, four, five, etc. The term“connection” may include both an indirect “connection” and a direct“connection.”

The terms “about,” “substantially,” “approximately,” and variationsthereof, are intended to include the degree of error associated withmeasurement of the particular quantity based upon the equipmentavailable at the time of filing the application. For example, “about”can include a range of ±8% or 5%, or 2% of a given value.

For the sake of brevity, conventional techniques related to making andusing aspects of the invention may or may not be described in detailherein. In particular, various aspects of computing systems and specificcomputer programs to implement the various technical features describedherein are well known. Accordingly, in the interest of brevity, manyconventional implementation details are only mentioned briefly herein orare omitted entirely without providing the well-known system and/orprocess details.

Turning now to an overview of technologies relevant to aspects of thedisclosed system for providing adaptive machine learning for edge-basedobject recognition, edge-based object recognition is the problem ofrecognizing objects in images and videos locally (e.g., at an edgedevice in a network of devices). Locally can mean on the same devicethat generates the images or videos or on another device in itsproximity (e.g., connected over a local area network) without having totransport the visual data over the Internet. A visual domain is aspecific visual environment defined by a subset of the universe ofobjects present in the environment, lighting conditions, cameraparameters, location, time, and other attributes that affect objectrecognition. Adaptive machine learning is the technique of adaptingmachine learning models to a specific visual domain. Collaborativeadaptive training is an adaptive machine learning technique wherein theadaptation of the machine learning model is achieved by collaborationamong multiple devices. Collaborative adaptive recognition is anapplication of adapted models trained in collaborative adaptive machinelearning training for object recognition. The machine learning algorithmcan be a deep learning algorithm or other statistical or knowledge-basedlearning algorithm.

Typical object recognition tasks do not occur locally. Instead, existinggeneral object recognition tasks typically send images captured by themobile devices to backend systems such as powerful server machinesand/or graphical processing units (GPUs) in a cloud environment thatperform the compute-intensive image processing tasks. In particular,these backend systems extract image features and match them to those ofannotated object images in a database. These image-matching systems relyon exact query images and manual labeling of an initial population ofannotated images in a database. Furthermore, they send raw images fromdevices to the servers and therefore incur high network bandwidth andenergy consumption and can also be a potential violation of userprivacy. Most existing systems also do not provide automated, continuousmethods for generating the labeled image databases (i.e. the database isconstructed offline after collecting data for a pre-specified location).

Recognition accuracy of existing object recognition methodologies candegrade when used in daily mobile scenarios due to challenges in termsof model inclusiveness, visual domain shift, and high resource costs.For example, regarding model inclusiveness, it is hard to know inadvance what objects are available in an environment to pre-train aninclusive recognition model for such an environment. Regarding visualdomain shift, visual domains are highly variable. Changes in imageresolution, lighting, background, viewpoint, and post-processing (or anycombinations of the above) can adversely impact the accuracy of computervision algorithms. In terms of high resource costs, existing objectrecognition techniques experience high cost in terms of bandwidth,energy, or privacy due to the requirement for uploading (e.g., over theInternet) raw image data to powerful server machines. Moreover, existingobject recognition techniques experience high computational costs andtime required for training machine learning models.

The model inclusiveness issue can be addressed using machine learninginstead of image matching methods. Such techniques train a modelrepresented as a multi-level neural network with very large imagedatasets. Specifically, the recently advanced Convolutional NeuralNetworks (CNNs) achieves the state-of-the-art performance on large-scaleobject recognition tasks (e.g., the 1000-class object classificationtask in the ImageNet Large Scale Visual Recognition Challenge (ILSVRC)).Such large-scale recognition models can be trained to recognize mostobjects in real-life usage. However, a machine learning neural networktrained using such large-scale datasets does not guarantee sufficientrecognition accuracy in each target visual domain (i.e., the contextwhere the machine learning model is applied to). For example, it canrecognize the inanimate animal specimens displayed in a museum but notthose alive in a zoo.

Typically machine learning models are large and perform objectrecognition in powerful backend server machines and/or cloudenvironments (e.g., the cloud computing environment 50 described in FIG.10). Simplified versions of machine learning models have also beenported to run on mainstream mobile platforms such as ANDROID® and IOS®.These models have less accuracy than their backend server counterpartsand/or are designed to perform specialized object recognition tasks(e.g. OCR language translation, etc.).

Object recognition accuracy of a generic machine learning model can beimproved using supervised machine learning model adaptation techniques.These adaptation techniques assume that the training data of the targetdomain is already available. An effective machine learning modeladaptation requires high-quality training instances (i.e., good imagefeature and correct image label) captured from the target visual domain.However, in an object recognition task, obtaining such high-qualitytraining instances is challenging due to the highly variable visualdomains. An additional major problem is that machine learning modeltraining approaches assume that training images must be uploaded to abackend server where machine learning model adaptation will occur. Thiscan incur high cost in terms of bandwidth energy and user privacy.

In summary, no existing object recognition approach effectivelyaddresses the challenges of inclusiveness, varying visual domains andcost in terms of mobile bandwidth, energy, and user privacy. Inaddition, no existing approach provides an efficient way for onlinetraining (either in terms of building the image database in case ofimage matching approach, or in terms of creating training instances andmodel adaptation in the machine learning approach).

Embodiments of the present invention relate to machine learning-basedapproaches that aim to solve the challenging object recognition problemsdescribed herein. Embodiments of the present invention createdomain-specific adaptation training instances using in-situ images fromparticipating devices and enable adaptive machine learning in bothpersonal spaces (e.g., home) and public spaces (e.g., museums, etc.).

Embodiments of the present invention associate an adapted model with atarget visual domain and include an adaptation training procedure and anobject recognition procedure. The adaptation training proceduregenerates training instances using images that match the contextualspecification of the target visual domain. Given an image matching thetarget visual domain, an object detection mechanism extracts existingobjects, and, for each object, a generic machine learning model storedin each device is used to generate machine learning model features andlabel recommendations to human users who then select a correct label.Machine learning features and human selected labels form traininginstances that are used to train an adapted model which corresponds tothe target visual domain. This enables devices to share traininginstances and adapted models through an adaptation database that can belocated at a central location or distributed among the devices. Theobject recognition procedure uses an existing adapted model incombination with a domain-aware adaptation of the stored generic machinelearning model.

Adaptation training and object recognition according to embodiments ofthe present invention can be performed on mobile devices or on a backendserver. This enables implementation of the embodiments of the presentinvention according to a wide spectrum of bandwidth and energyefficiency and privacy concerns. The machine learning model adaptationin mobile environments incurs minimal human effort for creatinghigh-quality training instances, respects user privacy, and is resourceefficient.

The advantages over prior approaches are that the embodiments of thepresent invention address at least the four challenges of objectrecognition outlined above. In particular, the embodiments of thepresent invention provide inclusiveness using a machine learning model.The embodiments of the present invention also adapt to variations invisual domains by generating and sharing training instances and adaptedmodels among multiple devices matching the target visual domain.Moreover, the adaptation training and object recognition procedures ofthe embodiments of the present invention can be executed locally to savemobile network bandwidth, energy, and preserve user privacy.Additionally, the embodiments of the present invention enable onlineadaptation training using a machine learning approach. These and otheradvantages will be apparent from the description that follows.

In one or more embodiments of the present invention, a method forcollaborative adaptive model training for mobile visual domains isprovided. According to embodiments of the invention, a machine learningmodel is adapted on a set of devices using labeled local images storedon the devices without requiring the devices to export raw images. Themachine learning model can be present on the device or can be downloadedfrom a server. The local images used for adaptation may not already belabeled, in which case an interactive labeling technique can be employedto have human users provide labels. The adaptation task can determine aset of worker devices containing a set of images that match the targetvisual domain specification.

According to one or more embodiments of the present invention, theadaptation task can be distributed to worker devices. Additionally oralternatively, the one or more embodiments of the present invention canutilize a cloud computing environment (e.g., the cloud computingenvironment 50) to perform the distribution described herein. A subsetof images to be labeled by each worker device can be chosen using a setof generic features extracted from the images and a distributedclustering algorithm. A plurality of object images can be extracted fromeach selected image using an object detection algorithm. Labelsuggestions and features to the human user can be automaticallygenerated for each object image using the generic machine learningmodel. A set of training instances can be generated using featuresextracted from the object image and the human-selected label. An adaptedmodel can be trained using the training instances and features for thetarget visual domain. The training instances and the adapted model canbe stored in an adaptation database.

In one or more embodiments of the present invention, a method foradaptive object recognition for visual domains is provided. A machinelearning model can be adapted for the target visual domains and can beapplied for object recognition. This can utilize obtaining a contextualspecification of the target visual domain. The adapted model can beidentified and loaded from an adaptation database matching thespecification of the target visual domain. The unadapted model can beapplied to cater to the target visual domain, and the results of thismodel can be fused with the results of the adapted model for classifyingobjects.

In one or more embodiments of the present invention, a method and systemfor contextual object detection using mobile cameras is provided.Contextual object detection detects one or more objects along with theirposition within an image in the context of a target visual domainwithout necessarily recognizing the identity or type of the objects.Object proposals are one or more candidate objects detected along withtheir position in an image, of which only a subset is eventuallyaccepted as objects. In the case of an example method, the method caninclude: partitioning a geographical area in multiple contextualdomains, each domain characterized by a maximum number k of objectproposals; capturing a digital image (I) through a mobile user camera;determining the current mobile contextual domain D; determining an upperbound k on number of objects of interest based on the mobile contextualdomain D; computing an image set M using multiple scaled copies forimage I; identifying a set of object bounding boxes using the upperbound k and a baseline object proposal algorithm for each scaled imagecopy in set M; and/or refining the set of bounding boxes by merging theboxes of scaled image copies to satisfy the constraint k.

FIG. 1 depicts a block diagram of a system 100 for an adaptive trainingprocedure according to one or more embodiments of the present invention.The system 100 is configured to create new adapted models or enhancesexisting adapted models for a target visual domain. The variouscomponents, modules, engines, etc. described regarding FIG. 1 can beimplemented as instructions stored on a computer-readable storagemedium, as hardware modules, as special-purpose hardware (e.g.,application specific hardware, application specific integrated circuits(ASICs), as embedded controllers, hardwired circuitry, etc.), or as somecombination or combinations of these. In examples, the engine(s) and/ormodules described herein can be a combination of hardware andprogramming. The programming can be processor executable instructionsstored on a tangible memory, and the hardware can include a processorfor executing those instructions. Thus a system memory can store programinstructions that when executed by the processor implement the enginesdescribed herein. Other engines can also be utilized to include otherfeatures and functionality described in other examples herein.

The system 100 can include a task initialization module 108, adomain-aware image selection module 110, a training instance generationmodule 112, and an adaptation training module 114. Alternatively oradditionally, the processing system 100 can include dedicated hardware,such as one or more integrated circuits, Application Specific IntegratedCircuits (ASICs), Application Specific Special Processors (ASSPs), FieldProgrammable Gate Arrays (FPGAs), or any combination of the foregoingexamples of dedicated hardware, for performing the techniques describedherein.

The adaptation training performed using the system 100 enables users tocollaboratively train a domain-aware adaptation model for a targetvisual domain. It is divided into the following steps: adaptation taskinitialization via the task initialization module 108; domain-awareimage selection via the domain-aware image selection module 110;training instance generation via the training instance generation 112,and model training 114.

Generally, the adaptation training includes adaptation taskinitialization 108, domain-aware image selection 110, training instancegeneration 112, and model construction (i.e., model training module114). The initiator 120 sends an adaptation task to the master 122. Theadaptation task characterizes the target visual domain by a set ofcontext attributes (i.e., specifications) such as location, time,weather, etc. The master 122 determines if new model needs to begenerated. If so, it requests workers 124, which may be mobile devices,to participate in training. As part of the domain-aware image selection110, the workers 124 select candidate images matching the taskspecification using a distributed clustering mechanism for image pruning(see FIG. 6).

One or more embodiments of the present invention can utilize a cloudcomputing environment (e.g., the cloud computing environment 50) toperform the distributed clustering. The training instance generationmodule 112 first detects objects within each candidate image and thencrops them as training object images. Object images are input to ageneric machine learning model that generates machine learning modelfeatures and recommended labels. Labels are presented to a user whoselects the correct label. The model training module 114 constructstraining instances from features and user selected labels that are usedto train an adapted model (i.e., an adaptation model). The adapted modeland training instances are stored in an adaptation database (not shown).

The model adaptation training should incur minimal human effort, respectuser privacy, be resource efficient, and be done in real-time. Thisexample achieves the above goals via the main system components,described herein.

The phrase “machine learning” broadly describes a function of electronicsystems that learn from data. A machine learning system, engine, ormodule can include a machine learning algorithm that can be trained,such as in an external cloud environment (e.g., the cloud computingenvironment 50), to learn functional relationships between inputs andoutputs that are currently unknown. In one or more embodiments, machinelearning functionality can be implemented using an artificial neuralnetwork (ANN) having the capability to be trained to perform a currentlyunknown function. In machine learning and cognitive science, ANNs are afamily of statistical learning models inspired by the biological neuralnetworks of animals, and in particular the brain. ANNs can be used toestimate or approximate systems and functions that depend on a largenumber of inputs.

ANNs can be embodied as so-called “neuromorphic” systems ofinterconnected processor elements that act as simulated “neurons” andexchange “messages” between each other in the form of electronicsignals. Similar to the so-called “plasticity” of synapticneurotransmitter connections that carry messages between biologicalneurons, the connections in ANNs that carry electronic messages betweensimulated neurons are provided with numeric weights that correspond tothe strength or weakness of a given connection. The weights can beadjusted and tuned based on experience, making ANNs adaptive to inputsand capable of learning. For example, an ANN for handwriting recognitionis defined by a set of input neurons that can be activated by the pixelsof an input image. After being weighted and transformed by a functiondetermined by the network's designer, the activation of these inputneurons are then passed to other downstream neurons, which are oftenreferred to as “hidden” neurons. This process is repeated until anoutput neuron is activated. The activated output neuron determines whichcharacter was read.

With continued reference to FIG. 1, the task initialization module 108is initialized by a user interested in recognizing objects in aparticular visual domain, or by a user who wishes to launch a trainingcampaign for a public space, etc. For example, adaptation taskinitialization (via the task initialization module 108) is initializedby a user (i.e., the initiator) interested in recognizing objects in aparticular visual domain (e.g., creating an adapted model for a personalspace with the help of friends) or by a user who wishes to launch atraining campaign for a public space (e.g., creating an adapted modelfor a museum with help of visitors). The initiator 120 first creates aspecification of the adaptation task and then it sends it to the master122.

In one or more embodiments of the present invention, the domain-awareimage selection module 110 can be run collaboratively amongparticipating devices (e.g., the workers 124). In such cases, itincludes a function that identifies on-device images that match a targetvisual domain specification, and a distributed clustering mechanism thatenables participating devices to collaboratively select a representativesubset of images, which may be subject to a per-device limit as to thenumber of selected images.

The training instance generation module 112 runs on each participatingdevice. It can include an object proposal algorithm targeted for fastand accurate extraction of object images from each selected image, and ageneric machine learning model. The generic machine model takes theproposed objects and automatically generates labeling recommendations tothe user of the device. The user selects a label for the object. Theimage features are simultaneously extracted from a hidden layer of thegeneric machine learning model. The label and image features form atraining instance for the target visual domain.

The adaptation training module 114 trains a model (e.g., support vectormachine (SVM)) using the resulting training instances from participatingcollaborative users. The adaptation training module 114 is of lowcomputational complexity and can run on a mobile device, a local device,a remote device, or another suitable device such as the processingsystem 900 of FIG. 9.

The adaptation training works by issuing adaptation training tasks toparticipating devices (e.g., the workers 124). Each adaptation tasktargets a particular visual domain. The adaptation training utilizes aninitiator 120, a master 122, and the workers 124.

The initiator 120 initializes an adaptation task by specifying thecharacteristics of the target visual domain and sending suchspecifications to the master 122. The initiator 120 can execute on amobile device, a local device, a remote device, or another suitabledevice such as the processing system 900 of FIG. 9.

The master 122 accepts an adaptation task request and coordinatescollaboration among the workers 124 for this task. The master 122 canexecute on a mobile device, a server, or another suitable device such asthe processing system 900 of FIG. 9.

Workers 124 receive and execute adaptation tasks. The task takes asinput images from the target visual domain and generates traininginstances. These training instances are used to train adapted models tothe target visual domain. Subsequently, each user can use this adaptedmodel for object recognition in the target visual domain. The workers124 are executed on devices of users, for example, or other suitabledevices.

The workers 124 can include generic deep machine learning model 126(e.g., the 1000-class AlexNet CNN model, which can be used on mobiledevices, a local device, a remote device, or another suitable device).The model 126 generates features and label recommendations for imageobjects.

An adaptation database (not shown) contains training instances andadapted models that are generated by adaptation tasks. Each traininginstance and adaptation model correspond to a target visual domain. Theadaptation database can be stored at a local or remote server or onanother suitable device, such as the processing 900 of FIG. 9. It canalso be distributed among multiple mobile devices since the generationof training instances and adaptation models can be performed on themobile devices.

The adaptation task specification characterizes the target visual domainby a set of context attributes such as location, time, weather, etc.These visual domain attributes aid workers in selecting matching imagesthey have on their devices. The attributes can be defined at differentlevels of granularity. For example, the location can be defined at thegranularity of places (e.g., restaurants, classrooms, bedrooms, etc.),or GPS coordinates, etc. Adaptation tasks can be initialized eitherremotely or locally. Any authorized initiators with no location or timeconstraint can initiate remote tasks. Local tasks are initialized by anonsite/local user who would like to train and use an adaptation modelfor the visual domain she is currently located.

FIG. 2 depicts a screenshot 200 of a local adaptation task specificationaccording to one or more embodiments of the present invention. The taskspecification includes information such as current time 202, currentlocation 204, time range (which can be set (e.g., using a slider)) 206,location range (which can be set (e.g., using a slider)) 208, andoptions to get candidate training images 210 and/or to train anadaptation model 212.

The visual domain attributes can be set by calling system APIs on theinitiator device (e.g., time and location). On receiving the taskspecifications, the master 122 first checks with the adaptation databaseif there is an existing adaptation model that matches the specifiedtarget visual domain. The model matching criteria can be flexiblydetermined (e.g., if the model is defined with location attribute as aregion (e.g., GPS coordinate+radius)), the master 122 can calculate andpresent the region overlapping ratio with existing adaptation models (ifdefined with location regions), and based on this information the taskinitiator 120 can make a decision on whether or not a new model shouldbe trained.

If a pre-trained model exists, the initiator 120 can select to use itdirectly or to enhance the existing model using more training instances.If this is a new adaptation task or the initiator 120 decides to enhancean existing model, the master 122 broadcasts the adaptation task toparticipating devices (e.g., the workers 124) with running workersoftware.

The adaptation task description contains directions to the prospectiveworkers 124. One or more embodiments of the present invention support atleast two scenarios of adaptation tasks. In a first scenario, a task canask users to use existing images stored in their devices. In a secondscenario, it can ask the user to take (i.e., capture) and label imagesof the target domain within a finite time interval. If a user is willingto participate, the user sends an acknowledgment back to the master(e.g., the master 122) and her device becomes a worker (e.g., one of theworkers 124).

The initiator (e.g., the initiator 120) can also specify an expirationtime for the adaptation task. When the task expires, the master stopsrecruiting new workers and will train an adaptation model using traininginstances created by existing workers.

Once the worker devices have been identified, they start executing theadaptation task as a collaborative group. This collaboration can beexecuted in a peer-to-peer fashion or can be coordinated by the master122.

Domain-aware image selection (via the domain-aware image selectionmodule 110) enables each worker (e.g., the workers 124) to scan itslocal storage to get a list of candidate images matching the taskspecification received from the initiator 120. The list of thesecandidate images can be very large and each image can contain multipleobjects. Manually labeling a large number of objects is exhaustive andimpractical. For example, if an image contains three objects on average,and a user takes five seconds to label one object, labeling 100 imageswill incur twenty-five minutes of the user's time.

In order to address the above problem, one or more embodiments of thepresent invention utilize an image pruning mechanism. First, the worker124 asks the user to specify the maximum number of images the user wouldlike to label or the maximum time that the user would be willing tospend labeling images (which is translated to a maximum number of imagesgiven a time estimate for labeling each image).

Assuming the maximum number of images for each user i is n_(i),embodiments of the present invention can use a clustering algorithm(e.g., k-means) to create n_(i) clusters each containing similar imagesand select the nearest neighbors to the cluster centroids asrepresentative images for the user to label. Clustering can be performedbased on various types of features extracted from the images. Forexample, Color and Edge Directivity Descriptor (CEDD) can be used. Amore computationally intensive alternative is to pass the images throughthe generic machine learning model and use the features output from theearlier (“more general”) stages. A potentially more accurate, yetcomputationally intensive, alternative is to use machine learning modelfeatures or candidate labels of the objects in each image. These can beobtained by passing the images through an object detection algorithm andthe resulting objects are passed to the generic machine learning model.

Running the above image pruning mechanism individually on each user'sdevice is not optimal in terms of user effort because different workers124 can have taken similar images and, without knowing what images areselected by other workers, duplicated objects can be included in theselected images of different workers. This can result in significantlyextra effort for each user. One way to address this problem is to use anextended version of the image pruning mechanism, where a distributedmechanism that provides for clustering coordinated by exchangingfeatures of images or cluster centroids among different users. Thisapproach can distribute the labeling effort to multiple users therebyminimize the labeling effort of each user.

On each participating device, the worker 124 passes the selected imagesthrough the training instance generation module 112. For an imagecontaining multiple objects, the pipeline first automatically detectsobjects within the image, and crops them out as training object images(i.e., an object image contains exactly one single object to belabeled). This automation can be achieved using state-of-the-art objectdetection algorithms such as EdgeBoxes. For objects missed by theautomated object detection algorithm, the system can also ask a user toidentify objects she would like to label by indicating the location ofthe object on the image shown on her phone screen. Upon such selection(e.g. by drawing around the object), a cropped object image is created.

Once the cropped object images are created (either automatically ormanually), they are input into the pre-installed generic machinelearning model which produces two outputs described below: (1) machinelearning model features and (2) candidate labels.

Machine learning model features are extracted from one of the hiddenlayers of the generic machine learning model. For image classificationtasks, the best performing machine learning models are ConvolutionalNeural Networks (CNNs) and their features are called ConvNet features.The extracted ConvNet feature has been proved to be quite discriminativeand has shown excellent performance in many different types ofapplications such as image retrieval and scene recognition.

A list of candidate labels for each object image can also be output.Although the recognition accuracy (Top-1) of a generic machine learningmodel may not be sufficiently acceptable for a given target visualdomain, it is likely that the correct prediction is included in theTop-K results (around 90% for Top-5). Furthermore, since each user isasked to label objects in her own images, there is a better chance forher to know what the objects are in her own images than labeling anyobject from other users' images.

The list of candidate correct labels is presented to the user. Thepresentation can be in various forms such as multiple choice buttons,menus, etc. A worker user selects the correct label by interacting withthe device interface. For an object image that does not have its correctlabel presented in the suggested labels, there are three options. First,a user can manually input the correct label but use autocompletesuggestion. Second, if a user does not recognize the object, she canlabel it as a special class “other.” Third, a user is also given theoption to skip labeling of this object image. Each <user-selected label,machine learning model feature> pair forms a new training instanceassociated with the target visual domain. Training instances are theninputted to the training adaptation pipeline to create an adapted model.

Model construction occurs in the training adaptation module 114. Whenparticipating workers 124 finish generating training instances or whenthe adaptation task expires, adaptation can be performed by using thetraining instances to create a new model using traditional trainingmethods (e.g., Softmax or SVM). The adaptation training can be doneeither at the master 122 or collaboratively among the workers 124 usinga distributed learning method.

The adapted model can be shared with participating users. This adaptedmodel, as well as the training instances, are stored in the adaptationdatabase (not shown) along with the corresponding specification of thatvisual domain and can be shared with other users with the sameadaptation requirement. New users can use the model directly or canincrementally train it with new training instances.

FIG. 3 depicts a flow diagram of a method 300 for object recognitionusing late fusion according to one or more embodiments of the presentinvention. First, an input image (block 302) is inserted into adomain-constrained machine learning (deep) model (block 304), which iscreated from a generic deep model. The domain-constrained machinelearning (deep) model is restricted to recognize only the classes of thetarget visual domain (e.g., the adaptation model) (block 306). Latefusion then occurs (block 308) to obtain predictions (block 310) bycombining the predictions of the domain-constrained machine learningmodel and the adapted model.

In particular, the method 300 performs object recognition on the targetvisual domain using a late fusion technique (block 308) that combinesthe recognition results of the domain constrained machine learning model(e.g., the domain constrained deep model at block 304) and the adapteddomain-specific model (e.g., adaptation model at block 306). Differentfrom existing works on late fusion, the late fusion technique describedherein does not require training a separate domain-specific machinelearning model. Instead, it provides the domain information (i.e., theset of existing classes/labels in the adapted model) to the genericmachine learning model so that it ignores domain-unrelated classes inits prediction.

The embodiments of the present invention enable object recognition onimages acquired in the target visual domain using both the adapted modeland a domain-constrained machine learning model as illustrated in FIG.3. Specifically, the embodiments of the present invention use latefusion to generate the final recognition result by considering thefollowing benefits: good performance with few training instances; simpleadaptation training; and sharing adaptation as a plug-in.

Simple adaptation training provides for training a learning model thatis fast and can be performed even on a single mobile device. This is incontrast to training a new machine learning model which utilizes apowerful processing system, such as a GPU-equipped server.

Sharing adaptation as a plug-in provides for easily sharing a model withother users who are interested in object recognition in such targetvisual domain. This is possible because a model has a smaller size thana generic machine learning model and can therefore be more easilyshared.

One issue in applying late fusion directly for adaptation of visualdomains is that traditional late fusion assumes that both the machinelearning model and the model recognize the same set of object classes.However, the set of object classes available in each target visualdomain is highly variable, and it is impractical to train or fine-tune amachine learning model for each domain. The domain-constrained machinelearning model described herein solves this problem.

The domain-constrained machine learning model, created from the genericmachine learning model, recognizes only the object classes included in atarget visual domain. The domain-constrained machine learning model isconstructed as follows. In one example, there are object classes from aset D in the target visual domain (i.e., classes in the adaptationmodel). For each input object image, the generic machine learning modeloutputs a prediction vector represented by the probabilities {p₁, p₂, .. . p_(S)} of that object image belonging to S different recognizableclasses by the generic model (where S is a superset of D). Given {p₁,p₂, . . . p_(S)}, the domain-constrained prediction output vector {P₁,P₂, P_(D)} is obtained by retaining the probabilities of the objectclasses in subset D and normalizing them using the following equation:

${{P_{d\; c\text{-}{deep}}(i)} = \frac{p_{i}}{\sum\limits_{n \in D}p_{n}}},{\forall{i \in D}}$

To obtain the final recognition result, late fusion is applied. Latefusion is a prediction technique wherein a final prediction for an inputis made based on some combination of the predictions of one or moremodels, without combining the models themselves. The object image isinput to both the domain-constrained machine learning model and theadapted model. Then a linear interpolation between the output predictionvectors of the adapted model and the domain-constrained machine learningmodel is used to compute a fused prediction as probability of aparticular object to belong to the object classes of the target visualdomain using the following equation:

P _(fused)(i)=aP _(ac-deep)(i)+(1−a)P _(shallow)(i),∀iϵD

The parameter α for late fusion can be determined throughexperimentation on training sets from similar visual domains.Alternatively, it can be feasible to monitor the inference error rate ofthe generic machine learning model in the interactive labeling processand adapt α accordingly. For example, if the generic model gives badsuggestions for labeling of the adaptation training images (e.g.,correct labels are ranked low), a small value can be set, andvice-versa.

FIG. 4 depicts a flow diagram of a method 400 for combined adaptationtraining and recognition according to one or more embodiments of thepresent invention. In this embodiment, the initiator 120 and master 122are on a single initiating device 402. In addition, the adaptationdatabase is distributed among the participating users. The initiatingdevice 402 wishes to perform object recognition on a new visual domain.

At block 404, it is determined whether a matched existing adaptationmodel exists. If yes, the adaptation model is loaded at block 414. Thenthis model is used for object recognition in conjunction with thepre-installed generic machine learning model to identify the object atblock 416.

However, if at block 404 it is determined that no adaptation model isloaded, a new adaptation task is created at block 406, and taskspecifications are sent to participating user devices at block 408. Itis then determined whether a matched existing adaptation model exists atblock 410. If so, the matched adaptation model is shared at block 412and the adapted model is sent back to the initiator who loads it intomemory. However, if no matched existing adaptation model exists at block410, training instance generation at block 418 (e.g., training instancegeneration module 112 of FIG. 1) occurs by performing candidate trainingimage lookup and applying a deep model to extract features on performinteractive labeling on participating devices. The training adaptionthen occurs by performing model training at block 420.

Additional processes also can be included, and it should be understoodthat the processes depicted herein represent illustrations and thatother processes can be added or existing processes can be removed,modified, or rearranged without departing from the scope and spirit ofone or more embodiments of the present invention.

FIG. 5 depicts an example of pseudo code 500 for an enhanced boundingboxes strategy for object detection according to one or more embodimentsof the present invention. Several computer vision applications such asaugmented reality and photo tagging, etc. utilize resource-intensivecomputer vision operations that include object detection. Severalsystems offload object detection computations to servers. Otherapproaches perform restrictive object recognition on mobile devices(e.g. only single-object images).

One or more embodiments of the present invention are directed toexploratory object detection on complex multi-object images taken bycameras of mobile devices such as smartphones, tablets, or wearableprocessing devices. Example intended applications could be automatedmobile photo tagging, mobile augmented reality, or semi-automatedgeneration of training instances for machine learning algorithms.

The object detection approach can be exploratory in nature (i.e. thereis no a priori knowledge as to the nature or shape of the objects to bedetected). For example, in an augmented reality photo taggingapplication a user can be in a new environment and need to tag objectsthat are identified on the camera view of her smartphone. For energy,privacy, and network bandwidth reasons, it can also be possible for thesystem to run object detection on the mobile phone instead of offloadingto servers.

The object detection provides for determining whether an object existsin an image, and if so where in the image it occurs. The objectdetection problem is difficult to solve in real time especially usingconstrained resources of mobile devices. Traditionally, the objectdetection problem over the past decades has been addressed with thesliding windows approach in which object classification is performed atevery location and scale in an image. Such approaches also requireexisting knowledge of the object to be detected and arecompute-intensive.

Instead of searching for an object at every image location and scale, aset of object bounding box proposals is first generated with the goal ofreducing the set of positions that need to be further analyzed. Withthis method, object proposals can be accurately generated in a mannerthat is agnostic to the type of object being detected. Several objectdetection algorithms currently use object proposal generators.

Therefore object proposal methods are suitable for exploratory objectdetection and are less compute intensive than sliding window methods.However, approaches based on object proposal methods are still notapplicable to mobile environments and applications. Existing objectproposal methods yield hundreds of object proposals per image, which isnot practical for human mobile phone users. Typically a human user willeither pay attention to a few objects of interest that appear in thelimited space of their mobile phone camera screen or in a photo taggingapplication will be willing to tag only a few objects.

In addition, when object proposal is used for tagging or for generatingtraining instances for machine learning algorithms, it has differentchallenges and requirements from the traditional bounding box proposalalgorithms used for known object detection tasks, including thefollowing. For example, it is hard to know the set of available objectsin advance. Good training images for the adaptation task should havemargins around the target objects to capture the target visual domaininformation. Users can be asked to select the correct label for eachobject/box and hence should identify fewer bounding boxes to minimizeusers' labeling efforts. Overly small boxes should be ignored becausetoo small boxes are unsuitable for adaptation training due to low imagequality.

Accordingly, embodiments of the present invention are provided herein toaddress the object detection problem for mobile phones using an objectproposal algorithm that utilizes mobile context. This is achieved byconstraining the number of object proposals analyzed by the objectdetection system based on mobile contextual information specific tomobile (i.e., user location, user preferences or other mobileapplication characteristics).

The embodiments of the present invention partition the geographical areawhere contextual object detection is to be applied in multiplecontextual domains and constrain the number of object proposals on eachdomain based on contextual information. The constraint is defined by theuser preferences (e.g., the user wishes to label up to k objects), byhistorical contextual knowledge (e.g., in the past a certain objectsinterest have been detected by other users in that area).

In the first step, the geographical area is partitioned into differentvisual domains, each domain characterized by a maximum number k ofobject proposals suitable for the domain. Each time the object detectionis run, a baseline object proposal algorithm such as EdgeBoxes is run onthe mobile device. To identify each individual object from compleximages with multiple objects, an object proposal algorithm, such as EdgeBoxes, is used to propose bounding boxes for potential objects.Traditionally, the object proposal method is used as an essential stepfor object detection that requires both high recall and high accuracy.Those requirements mean that the algorithm will locate as many aspossible bounding boxes, which inevitably propose too many noisyproposals.

However, for a mobile tagging system, it may not be necessary to achieveperfect recall and accuracy since the same object is quite likely to becaptured in other images or from other users, and of course, users wouldlike to deal with as few images as possible, therefore tagging effortwould be minimized. Therefore, the embodiments of the present inventionrun the object proposal technique as follows: (1) Based on usersatisfaction, only top k proposed bounding boxes (with the highestconfidence) are reserved, and typically k is very small (e.g., k⇐5).This contrasts classical object proposal methods, where hundreds ofbounding boxes are proposed. (2) Among the k bounding boxes, thebounding boxes with large overlap to other bounding boxes are removed.The remaining bounding boxes are cropped out from the original image asthe unlabeled training images.

More specifically the embodiments of the present invention provide forremoval of large and small boxes, equal regional distribution, andadding margins to bounding boxes.

Large bounding boxes proposed by the baseline object proposal algorithmwill normally cover more than one object in a multi-object image. On theother hand, if an object covers a large area of the photo, it istypically in a one-object image, which does not require the bounding boxidentification process. Lastly, small bounding boxes typically containunclear images that are not usable.

If the area of a proposed bounding box is larger than a certainpercentage (e.g., 40%, 20%, 45%, etc.) of the image area, then it can beconsidered to be “too large”. If the area is smaller than a certainpercentage (e.g. 1%, 5%, 20%, etc.) of the image area, it can beconsidered it to be “too small”. The embodiments of the presentinvention discard all “large” and “small” boxes.

Equal regional distribution enforces equal regional distribution ofbounding boxes in a given image. First, a given image is divided intofour equal regions: Upper Left, Lower Left, Upper Right, Lower Right.Next, if the bounding box being considered, (i.e., b_(i)), can beassigned to one of the four regions using the function equal regionillustrated in FIG. 2 is determined. This function ensures that (i) onlya maximum of j bounding boxes are retained among all regions, (ii) themaximum number of boxes assigned to a region is ceil(j/4).

For a bounding box with width w and height h, a larger box with width1.5*w and height 1.5*h is generated while keeping the original boxcenter.

When images are scaled to different resolutions, the baseline objectproposal algorithm (e.g., EdgeBoxes) detects objects at different detaillevels, and thus produces different sets of bounding boxes. The union ofeach set of proposed bounding boxes produced using different imageresolutions covers more complete objects. Unfortunately simply returningthe union of boxes at different scale can be overkill and can compromisethe design goal of limiting the number of boxes for a user to tag.Therefore, a box merging method is provided to remove redundant boxesfrom the union set. The redundant boxes are boxes with “nearly-the-same”visual content. Two boxes can be considered as having “nearly-the-same”visual content if their intersection area exceeds 50% of the area ofeach individual box. For such boxes, we merge by generating a union ofthese two boxes.

One or more embodiments of the present invention are directed to theinteractive generation of labeled data and training instances. Forexample, FIG. 7 depicts a method 700 for interactive generation oflabeled data and training instances according to one or more embodimentsof the present invention.

At block 702, a user is presented with options for selecting an amountof time the user is willing to spend labeling data that is unlabeled. Insome examples, the unlabeled data can be sensor data, audio, video, orimage data, or any other kind of data. The representative set ofunlabeled samples can be chosen based on clustering, principal componentanalysis, or any other statistical or analytical technique. Theunlabeled data samples can reside across a plurality of devices and maynot be exported or shared in raw. The unlabeled data samples canrepresent groups of samples instead of individual samples, e.g., animage containing multiple objects can represent a sample. At block 704,a representative set of unlabeled data samples is selected based atleast in part on the amount of time the user is willing to spendlabeling data.

At block 706, a set of suggested labels is generated for each of theunlabeled data samples of the set of unlabeled data. Once the set ofsuggested labels for each of the samples is generated and presented tothe user, the user selects one label for each sample. The selected labelis verified for truthfulness, and the selected label, along withfeatures automatically extracted from the sample, are stored as atraining instance. The data is stored along with its label and otherinformation such as visual domain, unique identifier, features, etc.

The suggested labels can be generated by application of a machinelearning model, by looking up labels applied to similar samples in thepast, or by any other means. A user can manually input the correct labelbut use autocomplete suggestion. If a user does not recognize theobject, she can label it as a special class “other.” A user can be giventhe option to skip labeling the data. Verification can be performedby 1) computing a similarity score of the data with data previouslylabeled with the same label and/or 2) using an identifier for thelabeled data and comparing the current label with labels given by otherusers for this labeled data using majority vote. The features of thesample can be extracted by application of a feature extractionalgorithm, another statistical technique, or any other approach.

Additional processes also can be included, and it should be understoodthat the processes depicted herein represent illustrations and thatother processes can be added or existing processes can be removed,modified, or rearranged without departing from the scope and spirit ofone or more embodiments of the present invention.

In particular, embodiments of the present invention described withrespect to FIG. 7 address the problem of creating labeled instances ofobjects in photos taken by mobile phones of human users. Such labels canbe used as training instances for supervised learning classificationtasks, for computer vision-based augmented reality applications or forcreating inventories of physical objects in the location where themobile images have been taken.

In supervised machine learning, the quality of labels assigned totraining instances is very important, especially when the number oftraining instances is limited. In addition, image labeling is anerror-prone process for various reasons, such as errors by the labeler,the imperfect description of classes, and the like. Also when multipleusers are involved in labeling, there is also a label consensus problemfor labeling the same object class.

Traditionally, labeling is mostly performed manually. Manual datalabeling is labor-intensive and prone to the human errors. The trainingdata it produces often lacks in both quantity and quality. Fullyautomatic data labeling, on the other hand, is not feasible andreliable.

Existing automatic labeling technique, though effective in someapplication scenarios, are still error prone especially on datagenerated in the wild (e.g., day life photos). To facilitate thelabeling process, interactive labeling techniques, which combine thepower of automatic image labeling and human feedback, have beeninvestigated by the machine learning community. Interactive labeling hasbeen proposed to combine the power of automatic image labeling and humanfeedback. Existing methods do not address the above problems effectivelyand are not applicable to mobile systems environments.

The embodiments of the present invention provide an interactive labelingtechnique for rapid creation of labeled data based on images taken bymobile phones (either stored photos or pointing the camera to a physicalscene as in augmented reality applications). According to theembodiments of the present invention, labeling is performed with minimalhuman effort where a machine learning model provides a set of candidaterecommendations presented as multiple choice to the user. The use ofmachine learning model helps in multiple ways. First, users can rapidlylabel objects in photos by selecting one of the recommendations. Second,the user labels are provided by the machine learning model classes;therefore, label inconsistencies of the same object from different usersare not arbitrary but constrained within the machine learning modelclasses. Third, machine learning models do not require a separate largedatabase of images as in classic object detection schemes. This enablesrunning the machine learning model-based labeling procedure on a mobiledevice as opposed to sending the photos to a remote server machine.

The resulting labeled image data can be used as training instances forother supervised learning classification tasks, for augmented realityapplications or for creating inventories of physical objects in thelocation where the images have been taken. The embodiments of thepresent invention have the following advantages over existingapproaches. In particular, embodiments of the present invention: areapplicable to mobile system environments and use mobile user input;minimize human labeling effort using machine learning modelrecommendations; address the incorrect labels and consensus problemusing a constrained set of classes from the machine learning model andunique labeled object identifiers; and avoid the usage of a separatelarge object database at a remote server. Instead, all computations canoccur using a generic machine learning model on the device.

According to examples of the interactive generation of labeled imagedata of one or more embodiments of the present invention, a genericmachine learning model is used to guide the human user in labelingimages in an effortless manner. The goal is to minimize human labelingeffort while increasing labeling accuracy.

On each participating mobile device, the system passes selected imagesthrough the label generation pipeline. For an image containing multipleobjects, the pipeline first automatically detects objects within theimage, and crops them out as object images, i.e., an image containsexactly one single object to be labeled. This automation can be achievedusing an object proposal algorithm (e.g., EdgeBoxes) that is adapted tomobile environments and aims to select a few object bounding boxes withhigh recall. Each selected photo is passed through an object detectionmodule, which identifies objects of interest in the image. Creatingcropped images from the original image can generate these objects.

Then these object images are input to a machine learning model modulethat returns a set of label recommendations to the user screen regardingeach object in the image. Since the machine learning model has beenpre-trained with many images, no separate object database is needed formatching the detected objects. The machine learning model also allowsfor exploratory labeling of images because no a priori knowledge isneeded about the nature of the objects being detected.

This design is based on the observation that, although the recognitionaccuracy (Top-1) of a generic machine learning model is not sufficientlygood (<60% for a dataset), it is quite likely that the correctprediction is included in the Top-K results (around 90% for Top-5).Furthermore, in case a user is asked to label objects in her own images,there is a better chance for her to know what the objects are in her ownimages than labeling any object from others' images. A user selects thecorrect label by tapping on the screen.

For an object image which does not have its correct label presented inthe suggested labels, there are multiple options: 1) a user can manuallyinput the correct label, such as using autocomplete suggestion (this canrequire the database to contain the class for that object); 2) if a userdoes not recognize the object, she can label it as a special class“other;” and 3) a user is also given the option to skip labeling of thisimage.

For verification purposes, it is possible to compute an identifier ofthe labeled object once a user creates it. This identifier isindependent of the user label and can be a function of the object imagecontent (e.g., a feature generated from the object image) and/or themobile context (e.g., location) where the object was detected.

Next, each object along with its label is passed to a verificationmodule that checks that the proposed label is truthful. The verificationmodule contains a database of previously labeled object images (eitherby other users or a pre-existing database). The module computes asimilarity score of the current image with other images under the samelabel. If the similarity score is high the cropped image is markedtruthful otherwise it is not. A second way to provide verification is touse the identifier of the labeled object. When another user labels thesame object, the system identifies the object based on the identifierand a majority vote is computed based on the labels previously providedfor the same object. If the proposed label is marked truthful it getsthe proposed label. Otherwise, the system discards the label.

In the last step, the object is stored along with additional informationthe system database of labeled objects for later use. Each user-selectedlabel, the object image, its unique identifier, its mobile context(e.g., a location) and potentially ConvNetfeatures of the machinelearning model forms a new labeled object entry stored in an objectdatabase.

According to one or more embodiments of the present invention,techniques for data clustering in heterogeneous distributed mobile cloudenvironments (e.g., the cloud computing environment 50) are provided.For example, FIG. 8 depicts a method 800 for distributed data clusteringaccording to embodiments of the present invention. In particular, themethod 800 provides for identifying representative samples from datasetsacross multiple devices.

At block 802, an initiator 120 initializes an adaptation task containinga contextual specification of a target visual domain. At block 804, amaster 122 determines a set of worker devices containing a set of imageswhose context matches the target visual domain contextual specification.At block 806, the master 122 distributes the adaptation task to theworker devices (e.g., workers 124). At block 808, the worker devicesdetermine a subset of images to be labeled by each worker device using aset of generic features extracted from the images and a distributedclustering algorithm. At block 810, the worker devices extract aplurality of object images from each selected image using an objectdetection algorithm.

At block 812, the worker devices generate a list of machine learningmodel features and a list of candidate labels for each object imageusing a generic machine learning model. At block 814, the worker devicesacquire a label for each object image by having a user of each workerdevice select among the list of candidate labels. At block 816, theworker devices generate a set of training instances. Each traininginstance includes machine learning model features and the human-selectedlabel. At block 818, the worker devices train an adapted model for thetarget mobile visual domain based at least in part on the set oftraining instances. At block 820, the worker devices store the traininginstance and the adapted model to an adaptation database.

Additional processes also can be included, and it should be understoodthat the processes depicted herein represent illustrations and thatother processes can be added or existing processes can be removed,modified, or rearranged without departing from the scope and spirit ofone or more embodiments of the present invention.

The embodiments of the present invention as described with respect toFIG. 8 are related to the distributed data collection andrepresentation. In several applications, there is a need to identify arepresentative collection of data among data sets distributed acrossheterogeneous sites. Each site can have different compute and storagecapabilities which can be captured as an upper bound on the number ofrepresentative data points. If each site computes representative datapoints using a clustering algorithm this will satisfy the requirement ofeach site but does not address the overlap issue. This means that siteswith high overlap will end up storing similar representative data. Onthe other hand, if all data is transmitted to a central site, it can bepossible to address the inclusiveness issue by computing representativedata based on some of the clusters and then distributing to each site anumber representative data according to its requirements. However, thiscase is inefficient from a bandwidth, energy and privacy point of view.

There exist different application scenarios where this problemarises: 1) mobile users labeling photos in a crowd sensing campaign, and2) distributed data deduplication. This application is typicallysplitting data files into multiple chunks and trying to keep one chunkin one site and pointers to that chunk on the other sites. Theembodiments of the present invention address these problems bycoordinating clustering operations among different sites.

In one example embodiment, consider a mobile crowd sensing application,including a master device and at least one worker device for objectextraction and labeling based on images stored on mobile devices. Inthis crowd sensing application, the mobile users (e.g., workers 124)receive a labeling task from the master (e.g., the master 122) and actas workers with the objective to label objects on candidate imagesstored in their mobile phones. The list of candidate images on eachphone can be very large and each image can contain multiple objects.Manually labeling a large number of objects is exhaustive andimpractical for humans. For example, if an image contains 3 objects onthe average, and a user takes 5 seconds to label one object (i.e.,create one training instance), labeling 100 images will incur 25minutes.

Therefore, each mobile user (e.g., workers 124) has a different limit onthe number of images she wishes to label. Given this maximum limit, themethod should select a subset of images that collectively contain amaximum number of distinct objects.

An additional challenge that arises is that when multiple users areinvolved, the selection algorithm should also avoid having workers labelmany duplicated objects. An additional challenge is that, due to privacyconsiderations, it is not possible to determine duplicate objects byexchanging raw images among workers.

With regards to distributed image pruning, one problem can be set forthas follows: there is only a single worker with identity u_i, who wantsto label up to n_i (n_i belongs to Z+) images from the set of m_i(assuming m_i>n_i, m_i belongs to Z+) candidate images, and it isdesired to maximize the number of distinct objects covered in theselected images. However, it is unknown what objects are included ineach image, and it is also not possible to identify them manually. Tofind a feasible solution, the present approach is based on the premisethat, if the visual appearance of two images is considerably different,the possibility that the two images contain the same object is verysmall. Thus, instead of directly maximizing the number of distinctobjects, alternatively a subset of images with a large visual differenceis identified.

The embodiments of the present invention assume that an image featurevector that captures visual difference between images has been extractedfrom each candidate image, and the m_i candidate image feature vectorsare clustered into n_i clusters, using a clustering algorithm (e.g.,K-means). Then, for each cluster, only one image that is the nearestneighbor to the cluster centroid is retained.

Another example of this problem for multiple users is as follows: For alabeling task, there are N participating workers with identities {u_1, .. . , u_N} (N belongs to Z+). Each worker u_i (1≤i≤N) wants to label asubset of at most n_i images out of the m_i candidate images in herlocal device, and she can join the labeling task at any time point aslong as the task has not expired.

It can be desirable to maximize the number of distinct objects coveredin the selected images of all workers. It is unknown what objects areincluded in each image. A subset of images with a large visualdifference is identified. However, in this case running the clusteringalgorithm over extracted image features on each individual worker'sdevice as in the single worker case described above, is not the optimalsolution. The reason is that different workers can have taken similarimages, and without knowing what images other workers select, duplicatedobjects can be included in the selected images of collaborating workers.

Two special scenarios can arise as follows. In a first scenario(referred to as a “one-after-another asynchronous scenario”), it isassumed that a new worker, u_j, can only join the adaptation task afteranother participating worker, u_i, has selected the subset n_i of imagesout of its m_i candidate images to retain. To make the new worker awareof what images are retained in other workers' devices, the systemrequires a worker to send the image features of the selected images tothe master immediately after her image selection. Let u_1, u_2, . . . ,u_N denote the sequence of workers joining the task.

The first worker, u_1, who first joined this task, clusters its m_1candidate images to n_1 clusters (as in the simplest single-worker casedescribed above). Let C_1 be the set of n_1 cluster centroids and R_1 bethe set of n_1 image feature vectors that are nearest neighbors to eachof the cluster centroids in C_1. Worker u_1 retains the imagescorresponding to the feature set R_1 for labeling. It then forms the setS_1 using the feature vectors R_1 of the retained images, or using thecentroid set C_1 for privacy considerations. Then it sends set S_1 tothe master that stores it as set M_1. The second worker u_2 firstreceives the set M_1 from the master (which contains n_1 retained imagefeatures or centroids of worker u_1). Then a 2-step method is executedon the device of worker u_2.

In step 1, worker u_2 clusters its m_2 candidate images to n_1+n_2clusters. Let C′_2 be the set of n_1+n_2 cluster centroids and R′_2 bethe set of n_1+n_2 image feature vectors of worker u_2 that are nearestneighbors to the cluster centroids in C′_2. In step 2, worker u_2 formsa set R_2 of n_2 image feature vectors from R′_2 as follows. First, aset D_2 is formed by finding in set R′_2 the nearest neighbor of each ofthe n_1 feature vectors in set M_1 received by the master. R_2 is formedby subtracting D_2 from R′_2. Also let C_2 be the subset of C′_2 whosecentroids correspond to the image features in R2.

Worker u_2 then forms the set S_2 using the feature vectors R_2 of theretained images, or using the centroid set C_2 for privacyconsiderations. Then it sends set S_2 to the master. The master formsthe set M2 as a concatenation of M_1 and S_2.

The same procedure is iteratively followed by the following new usersu_3, . . . , uN. Each new user u_i (3⇐i⇐N) receives vector M_i from themaster and uses the above procedure to create its retention set R_i ofimages to label and centroid set C_i. Then, it sends set S_i that iseither its retention set R_i or centroid set C_i to the master. Then themaster creates and stores the vector M_i for the next iteration as aconcatenation of sets M_{i−1} and S_i.

Let |M_i| denote the number of elements of set M_i. To avoid incurringtoo much communication and computational cost, a predefined thresholdx_i (x_i≤|M_i|) can be set by each worker u_i so that the master willsend at most x_i image features instead of |M_i| to the next worker. Theset of x_i image features can be determined by either random selectionor clustering over all M_i feature vectors.

In the second scenario, it is assumed that all N workers join theadaptation task simultaneously (i.e., no single worker has selected aset of retained images before other workers. This can happen whenmultiple workers actively accepting new adaptation tasks). Each workeru_i (1⇐i⇐n) specifies the number of images she would like to label, n_i,and the master notifies each worker that there are other existingworkers. The proposed synchronized solution for this scenario is asfollows:

Each worker u_i forms a first retention set R′_i and cluster centroidset C′_i of n_i+t_i elements each by clustering her own m_i candidateimages to n_i+t_i clusters (where 0⇐t_i⇐m_i−n_i), and for each cluster,retaining the nearest neighbor to the cluster centroid. Here, t_i moreimages for each worker are selected based on the expectation that n_iimages from the n_i+t_i images in set R′_i that are unique to thisworker can be found.

Each worker then forms set S_i using using the set R′_i or centroids setC′_i for privacy considerations and sends set S_i to the master. Onreceiving all sets S_i from all N workers, the master concatenates themin a set M_i and executes a second clustering to cluster the featurevectors of M_i in n_1+n_2+ . . . +n_N clusters. For each new cluster, ifthe cluster members are from two different workers, just one of them isretained. Then, the information (e.g., id, or index) of the retainedimages is sent by the master back to each worker. Finally the workerforms its retention set R_i as a subset of R′_i by keeping the imagesthat correspond to the indices sent by the master.

According to embodiments of the present invention for data clustering inheterogeneous distributed mobile cloud environments (e.g., the cloudcomputing environment 50), the solutions of the above two specialscenarios can be combined using the pseudo code 600 in illustrated inFIG. 6 which is run on each worker according to one or more embodimentsof the present invention. First, each worker receives the set ofexisting features from the master, and it checks with the master ifthere are synchronized co-workers. If no co-worker exists, it falls backto the one-after-another asynchronous scenario. Otherwise if a co-workerexists, it first runs the asynchronous method to get t more clusters andrelies on the master for a second round clustering as that in theall-together synchronized scenario. The updateFromMaster functionreceives a list of identifiers for the retained images from the master.

The following represent additional embodiments of the present invention.It should be appreciated that these embodiments are merely examples.

In one or more embodiments of the present invention, a method formachine learning model-based recognition for visual domains is provided.The method can include at least one of the following: obtaining acontextual specification of the target visual domain; identifying andloading from an adaptation database an adapted model whose contextmatches target visual domain; receiving images from the target mobilevisual domain; detecting image objects in the images using an objectdetection algorithm; and/or classifying said image objects by fusing theresults of the adapted model and a domain-constrained machine learningmodel.

In yet another embodiment of the present invention, a system for machinelearning model-based adaptation training and object recognition forvisual domains is provided. The system can include a memory comprisingcomputer readable instructions and a processing device for executing thecomputer readable instructions for performing a method. The method caninclude at least one of the following: determining a contextualspecification for a target visual domain; extracting context from animage on a device; matching such image context to a contextualspecification of a visual domain; performing image pruning from a set ofimages; detecting one or more objects in an image; computing objectfeatures and label recommendations using a generic machine learningmodel; selecting a label among a set of label recommendations;generating a training instance based on object features and user-definedlabels; training a adapted model based on generated training instances;storing adapted models and generated training instances using anadaptation database; sharing adaptation models and training instancesamong multiple devices; constraining a generic machine learning model toa domain-constrained machine learning model; and/or fusing the result ofa domain-constrained machine learning model with the result of anadapted model.

It is understood that one or more embodiments of the present inventionare capable of being implemented in conjunction with any other type ofcomputing environment now known or later developed. For example, FIG. 9depicts a block diagram of a processing system for implementing thetechniques described herein. In examples, processing system 900 has oneor more central processing units (processors) 21 a, 21 b, 21 c, etc.(collectively or generically referred to as processor(s) 21 and/or asprocessing device(s)). According to one or more embodiments of thepresent invention, each processor 21 can include a reduced instructionset computer (RISC) microprocessor. Processors 21 are coupled to systemmemory (e.g., random access memory (RAM) 24) and various othercomponents via a system bus 33. Read only memory (ROM) 22 is coupled tosystem bus 33 and can include a basic input/output system (BIOS), whichcontrols certain basic functions of processing system 900.

Further illustrated are an input/output (I/O) adapter 27 and acommunications adapter 26 coupled to system bus 33. I/O adapter 27 canbe a small computer system interface (SCSI) adapter that communicateswith a hard disk 23 and/or a tape storage drive 25 or any other similarcomponent. I/O adapter 27, hard disk 23, and tape storage device 25 arecollectively referred to herein as mass storage 34. Operating system 40for execution on processing system 900 can be stored in mass storage 34.A network adapter 26 interconnects system bus 33 with an outside network36 enabling processing system 900 to communicate with other suchsystems.

A display (e.g., a display monitor) 35 is connected to system bus 33 bydisplay adaptor 32, which can include a graphics adapter to improve theperformance of graphics intensive applications and a video controller.According to one or more embodiments of the present invention, adapters26, 27, and/or 32 can be connected to one or more I/O busses that areconnected to system bus 33 via an intermediate bus bridge (not shown).Suitable I/O buses for connecting peripheral devices such as hard diskcontrollers, network adapters, and graphics adapters typically includecommon protocols, such as the Peripheral Component Interconnect (PCI).Additional input/output devices are shown as connected to system bus 33via user interface adapter 28 and display adapter 32. A keyboard 29,mouse 30, and speaker 31 can be interconnected to system bus 33 via userinterface adapter 28, which can include, for example, a Super I/O chipintegrating multiple device adapters into a single integrated circuit.

According to one or more embodiments of the present invention,processing system 900 includes a graphics processing unit 37. Graphicsprocessing unit 37 is a specialized electronic circuit designed tomanipulate and alter memory to accelerate the creation of images in aframe buffer intended for output to a display. In general, graphicsprocessing unit 37 is very efficient at manipulating computer graphicsand image processing, and has a highly parallel structure that makes itmore effective than general-purpose CPUs for algorithms where processingof large blocks of data is done in parallel.

Thus, as configured herein, processing system 900 includes processingcapability in the form of processors 21, storage capability includingsystem memory (e.g., RAM 24), and mass storage 34, input means such askeyboard 29 and mouse 30, and output capability including speaker 31 anddisplay 35. According to one or more embodiments of the presentinvention, a portion of system memory (e.g., RAM 24) and mass storage 34collectively store an operating system such as the AIX® operating systemfrom IBM Corporation to coordinate the functions of the variouscomponents shown in processing system 900.

One or more embodiments of the present invention can be implemented oncloud computing. Cloud computing is a model of service delivery forenabling convenient, on-demand network access to a shared pool ofconfigurable computing resources (e.g. networks, network bandwidth,servers, processing, memory, storage, applications, virtual machines,and services) that can be rapidly provisioned and released with minimalmanagement effort or interaction with a provider of the service. Thiscloud model can include at least five characteristics, at least threeservice models, and at least four deployment models.

Characteristics are as follows:

On-demand self-service: a cloud consumer can unilaterally provisioncomputing capabilities, such as server time and network storage, asneeded automatically without requiring human interaction with theservice's provider.

Broad network access: capabilities are available over a network andaccessed through standard mechanisms that promote use by heterogeneousthin or thick client platforms (e.g., mobile phones, laptops, and PDAs).

Resource pooling: the provider's computing resources are pooled to servemultiple consumers using a multi-tenant model, with different physicaland virtual resources dynamically assigned and reassigned according todemand. There is a sense of location independence in that the consumergenerally has no control or knowledge over the exact location of theprovided resources but can be able to specify location at a higher levelof abstraction (e.g., country, state, or datacenter).

Rapid elasticity: capabilities can be rapidly and elasticallyprovisioned, in some cases automatically, to quickly scale out andrapidly released to quickly scale in. To the consumer, the capabilitiesavailable for provisioning often appear to be unlimited and can bepurchased in any quantity at any time.

Measured service: cloud systems automatically control and optimizeresource use by leveraging a metering capability at some level ofabstraction appropriate to the type of service (e.g., storage,processing, bandwidth, and active user accounts). Resource usage can bemonitored, controlled, and reported providing transparency for both theprovider and consumer of the utilized service.

Service Models are as follows:

Software as a Service (SaaS): the capability provided to the consumer isto use the provider's applications running on a cloud infrastructure.The applications are accessible from various client devices through athin client interface such as a web browser (e.g., web-based e-mail).The consumer does not manage or control the underlying cloudinfrastructure including network, servers, operating systems, storage,or even individual application capabilities, with the possible exceptionof limited user-specific application configuration settings.

Platform as a Service (PaaS): the capability provided to the consumer isto deploy onto the cloud infrastructure consumer-created or acquiredapplications created using programming languages and tools supported bythe provider. The consumer does not manage or control the underlyingcloud infrastructure including networks, servers, operating systems, orstorage, but has control over the deployed applications and possiblyapplication hosting environment configurations.

Infrastructure as a Service (IaaS): the capability provided to theconsumer is to provision processing, storage, networks, and otherfundamental computing resources where the consumer is able to deploy andrun arbitrary software, which can include operating systems andapplications. The consumer does not manage or control the underlyingcloud infrastructure but has control over operating systems, storage,deployed applications, and possibly limited control of select networkingcomponents (e.g., host firewalls).

Deployment Models are as follows:

Private cloud: the cloud infrastructure is operated solely for anorganization. It can be managed by the organization or a third party andcan exist on-premises or off-premises.

Community cloud: the cloud infrastructure is shared by severalorganizations and supports a specific community that has shared concerns(e.g., mission, security requirements, policy, and complianceconsiderations). It can be managed by the organizations or a third partyand can exist on-premises or off-premises.

Public cloud: the cloud infrastructure is made available to the generalpublic or a large industry group and is owned by an organization sellingcloud services.

Hybrid cloud: the cloud infrastructure is a composition of two or moreclouds (private, community, or public) that remain unique entities butare bound together by standardized or proprietary technology thatenables data and application portability (e.g., cloud bursting forload-balancing between clouds).

A cloud computing environment is service oriented with a focus onstatelessness, low coupling, modularity, and semantic interoperability.At the heart of cloud computing is an infrastructure comprising anetwork of interconnected nodes.

Referring now to FIG. 10, illustrative cloud computing environment 50 isillustrated. As shown, cloud computing environment 50 comprises one ormore cloud computing nodes 10 with which local computing devices used bycloud consumers, such as, for example, personal digital assistant (PDA)or cellular telephone 54A, desktop computer 54B, laptop computer 54C,and/or automobile computer system 54N can communicate. Nodes 10 cancommunicate with one another. They can be grouped (not shown) physicallyor virtually, in one or more networks, such as Private, Community,Public, or Hybrid clouds as described hereinabove, or a combinationthereof. This allows cloud computing environment 50 to offerinfrastructure, platforms and/or software as services for which a cloudconsumer does not need to maintain resources on a local computingdevice. It is understood that the types of computing devices 54A-N shownin FIG. 10 are intended to be illustrative only and that computing nodes10 and cloud computing environment 50 can communicate with any type ofcomputerized device over any type of network and/or network addressableconnection (e.g., using a web browser).

Referring now to FIG. 11, a set of functional abstraction layersprovided by cloud computing environment 50 (FIG. 10) is shown. It shouldbe understood in advance that the components, layers, and functionsshown in FIG. 11 are intended to be illustrative only and embodiments ofthe invention are not limited thereto. As illustrated, the followinglayers and corresponding functions are provided:

Hardware and software layer 60 includes hardware and softwarecomponents. Examples of hardware components include: mainframes 61; RISC(Reduced Instruction Set Computer) architecture based servers 62;servers 63; blade servers 64; storage devices 65; and networks andnetworking components 66. In some embodiments, software componentsinclude network application server software 67 and database software 68.

Virtualization layer 70 provides an abstraction layer from which thefollowing examples of virtual entities can be provided: virtual servers71; virtual storage 72; virtual networks 73, including virtual privatenetworks; virtual applications and operating systems 74; and virtualclients 75.

In one example, management layer 80 can provide the functions describedbelow. Resource provisioning 81 provides dynamic procurement ofcomputing resources and other resources that are utilized to performtasks within the cloud computing environment. Metering and Pricing 82provide cost tracking as resources are utilized within the cloudcomputing environment, and billing or invoicing for consumption of theseresources. In one example, these resources can comprise applicationsoftware licenses. Security provides identity verification for cloudconsumers and tasks, as well as protection for data and other resources.User portal 83 provides access to the cloud computing environment forconsumers and system administrators. Service level management 84provides cloud computing resource allocation and management such thatrequired service levels are met. Service Level Agreement (SLA) planningand fulfillment 85 provides pre-arrangement for, and procurement of,cloud computing resources for which a future requirement is anticipatedin accordance with an SLA.

Workloads layer 90 provides examples of functionality for which thecloud computing environment can be utilized. Examples of workloads andfunctions which can be provided from this layer include: mapping andnavigation 91; software development and lifecycle management 92; virtualclassroom education delivery 93; data analytics processing 94;transaction processing 95; and collaborative adaptive machine learning96.

The present techniques can be implemented as a system, a method, and/ora computer program product. The computer program product can include acomputer readable storage medium (or media) having computer readableprogram instructions thereon for causing a processor to carry outaspects of one or more embodiments of the present invention.

The computer readable storage medium can be a tangible device that canretain and store instructions for use by an instruction executiondevice. The computer readable storage medium can be, for example, but isnot limited to, an electronic storage device, a magnetic storage device,an optical storage device, an electromagnetic storage device, asemiconductor storage device, or any suitable combination of theforegoing. A non-exhaustive list of more specific examples of thecomputer readable storage medium includes the following: a portablecomputer diskette, a hard disk, a random access memory (RAM), aread-only memory (ROM), an erasable programmable read-only memory (EPROMor Flash memory), a static random access memory (SRAM), a portablecompact disc read-only memory (CD-ROM), a digital versatile disk (DVD),a memory stick, a floppy disk, a mechanically encoded device such aspunch-cards or raised structures in a groove having instructionsrecorded thereon, and any suitable combination of the foregoing. Acomputer readable storage medium, as used herein, is not to be construedas being transitory signals per se, such as radio waves or other freelypropagating electromagnetic waves, electromagnetic waves propagatingthrough a waveguide or other transmission media (e.g., light pulsespassing through a fiber-optic cable), or electrical signals transmittedthrough a wire.

Computer readable program instructions described herein can bedownloaded to respective computing/processing devices from a computerreadable storage medium or to an external computer or external storagedevice via a network, for example, the Internet, a local area network, awide area network and/or a wireless network. The network can comprisecopper transmission cables, optical transmission fibers, wirelesstransmission, routers, firewalls, switches, gateway computers and/oredge servers. A network adapter card or network interface in eachcomputing/processing device receives computer readable programinstructions from the network and forwards the computer readable programinstructions for storage in a computer readable storage medium withinthe respective computing/processing device.

Computer readable program instructions for carrying out operations ofone or more embodiments of the present invention can be assemblerinstructions, instruction-set-architecture (ISA) instructions, machineinstructions, machine dependent instructions, microcode, firmwareinstructions, state-setting data, or either source code or object codewritten in any combination of one or more programming languages,including an object oriented programming language such as Smalltalk, C++or the like, and conventional procedural programming languages, such asthe “C” programming language or similar programming languages. Thecomputer readable program instructions can execute entirely on theuser's computer, partly on the user's computer, as a stand-alonesoftware package, partly on the user's computer and partly on a remotecomputer or entirely on the remote computer or server. In the latterscenario, the remote computer can be connected to the user's computerthrough any type of network, including a local area network (LAN) or awide area network (WAN), or the connection can be made to an externalcomputer (for example, through the Internet using an Internet ServiceProvider). In some examples, electronic circuitry including, forexample, programmable logic circuitry, field-programmable gate arrays(FPGA), or programmable logic arrays (PLA) can execute the computerreadable program instructions by utilizing state information of thecomputer readable program instructions to personalize the electroniccircuitry, in order to perform aspects of one or more embodiments of thepresent invention.

Aspects of one or more embodiments of the present invention aredescribed herein with reference to flowchart illustrations and/or blockdiagrams of methods, apparatus (systems), and computer program productsaccording to one or more embodiments of the present invention. It willbe understood that each block of the flowchart illustrations and/orblock diagrams, and combinations of blocks in the flowchartillustrations and/or block diagrams, can be implemented by computerreadable program instructions.

These computer readable program instructions can be provided to aprocessor of a general purpose computer, special purpose computer, orother programmable data processing apparatus to produce a machine, suchthat the instructions, which execute via the processor of the computeror other programmable data processing apparatus, create means forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks. These computer readable program instructionscan also be stored in a computer readable storage medium that can directa computer, a programmable data processing apparatus, and/or otherdevices to function in a particular manner, such that the computerreadable storage medium having instructions stored therein comprises anarticle of manufacture including instructions which implement aspects ofthe function/act specified in the flowchart and/or block diagram blockor blocks.

The computer readable program instructions can also be loaded onto acomputer, other programmable data processing apparatus, or other deviceto cause a series of operational steps to be performed on the computer,other programmable apparatus or other device to produce a computerimplemented process, such that the instructions which execute on thecomputer, other programmable apparatus, or other device implement thefunctions/acts specified in the flowchart and/or block diagram block orblocks.

The flowchart and block diagrams in the figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods, and computer program products according to variousaspects of one or more embodiments of the present invention. In thisregard, each block in the flowchart or block diagrams can represent amodule, segment, or portion of instructions, which comprises one or moreexecutable instructions for implementing the specified logicalfunction(s). In some alternative implementations, the functions noted inthe block can occur out of the order noted in the figures. For example,two blocks shown in succession can, in fact, be executed substantiallyconcurrently, or the blocks can sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustration, andcombinations of blocks in the block diagrams and/or flowchartillustration, can be implemented by special purpose hardware-basedsystems that perform the specified functions or acts or carry outcombinations of special purpose hardware and computer instructions.

The descriptions of the various embodiments of the present inventionhave been presented for purposes of illustration, but are not intendedto be exhaustive or limited to the embodiments disclosed. Manymodifications and variations will be apparent to those of ordinary skillin the art without departing from the scope and spirit of the describedtechniques. The terminology used herein was chosen to best explain theprinciples of the present techniques, the practical application ortechnical improvement over technologies found in the marketplace, or toenable others of ordinary skill in the art to understand the techniquesdisclosed herein.

What is claimed: 1-10. (canceled)
 11. A system for adaptive objectrecognition for a target visual domain given a generic machine learningmodel, the system comprising: a memory comprising computer readableinstructions; and a processing device for executing the computerreadable instructions for performing a method, the method comprising:creating, by the processing device, an adapted model and identifyingclasses of the target visual domain using the generic machine learningmodel; creating, by the processing device, a domain-constrained machinelearning model based at least in part on the generic machine learningmodel such that the domain-constrained machine learning model isrestricted to recognize only the identified classes of the target visualdomain; and computing, by the processing device, a recognition resultbased at least in part on combining predictions of thedomain-constrained machine learning model and the adapted model.
 12. Thesystem of claim 11, wherein combining the predictions further comprisesinputting an object image into the domain-constrained machine learningmodel.
 13. The system of claim 12, wherein combining the predictionsfurther comprises inputting an object image into the adapted model. 14.The system of claim 12, wherein combining the predictions furthercomprises performing a linear interpolation.
 15. The system of claim 14,wherein the linear interpolation is performed based at least in part onan output prediction vector of the adapted model and an outputprediction vector of the domain-constrained machine learning model. 16.The system of claim 14, wherein combining the predictions furthercomprises computing a fused prediction as a probability of a particularobject belonging to an object class of the target visual domain based atleast in part on the linear interpolation.
 17. The system of claim 11,wherein the domain-constrained machine learning model is created byconstraining the domain of a generic machine learning model.
 18. Thesystem of claim 11, wherein combining the predictions is performedwithout training a separate domain-specific machine learning model. 19.The system of claim 11, wherein combining the predictions furthercomprises inputting features extracted from an object image into thedomain-constrained machine learning model.
 20. A computer programproduct for adaptive object recognition for a target visual domain givena generic machine learning model, the computer program productcomprising: a computer readable storage medium having programinstructions embodied therewith, the program instructions executable bya processing device to cause the processing device to perform a methodcomprising: creating, by the processing device, an adapted model andidentifying classes of the target visual domain using the genericmachine learning model; creating, by the processing device, adomain-constrained machine learning model based at least in part on thegeneric machine learning model such that the domain-constrained machinelearning model is restricted to recognize only the identified classes ofthe target visual domain; and computing, by the processing device, arecognition result based at least in part on combining predictions ofthe domain-constrained machine learning model and the adapted model.